--- src/pstree.c
+++ src/pstree.c	2010-07-13 10:14:50.978925622 +0000
@@ -868,7 +868,7 @@ int main(int argc, char **argv)
     } else if (isatty(1) && (termname = getenv("TERM")) &&
                (strlen(termname) > 0) &&
                (setupterm(NULL, 1 /* stdout */ , NULL) == OK) &&
-               (tigetstr("acsc") > 0)) {
+               ((int)tigetstr("acsc") > 0)) {
         /*
          * Failing that, if TERM is defined, a non-null value, and the terminal
          * has the VT100 graphics charset, use it.